# Vitamin D Supplements: 4 Warning Signs You May Be Taking Too Much
Vitamin D plays an important role in bone health, muscle function, and calcium balance. Many people take supplements because they have low vitamin D levels or limited sun exposure.
But more is not always better.
Vitamin D toxicity is uncommon, but it can happen when someone takes **excessively high doses of vitamin D supplements**, usually over time. The main problem is that too much vitamin D can cause calcium levels in the blood to rise too high, a condition called **hypercalcemia**. ([Mayo Clinic][1])
That does **not** mean everyone taking vitamin D should stop. If you are taking a dose prescribed by your healthcare professional, follow their advice unless they tell you otherwise.
## 1. Nausea, Vomiting, or Loss of Appetite
One of the more common signs of excessive vitamin D is digestive upset.
Possible symptoms include:
* Nausea
* Vomiting
*
